The calf of the Brogini Child's Derbyshire boots are made from a soft and flexible synthetic leather to minimise aftercare and provide a water resistant barrier, while the foot is made from a natural nubuck leather. The Derbyshire is fully waterproof up to the middle of the calf thanks to a specially engineered waterproof membrane and waterproof insole and has been thoroughly tested to ensure your feet stay dry even in the wettest weather.